Sound-muffler.



. Draftsman,

PATENTED MAR. 24, 1908.

J. P. a; H. M. HIRSH.

SOUND MUFFLER.

APPLICATION FILED AUG. 5, 1901.

\nvsnhovs John F. H'nsh Witnesses ran/ 0.1 2

ATT'YS.

JOHN F. HIRSH AND HAROLD M. HIRSH, OF ST. LOUIS, MISSOURI.

SOUND-MUFFLER.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed August 5, 1907. Serial No. 387,220.

T 0 all whom it may concern:

Be it known that we, JOHN F. HIRSH and HAROLD M. HIRSH, both citizens of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Sound-Mufflers, of which the following is a full, clear, and exact description, such aswill enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a perspective view of a device embodying the features of our invention; Fig. 2 1s a cross sectional view of the device; and Fig. 3 is a detail view illustrating the connection between the muffler and the part 6.

This invention relates to sound mufflers such as are placed over one ear of a person while a telephone receiver is being held to the other car.

The object of our invention is to provide a device of the character referred to which will effectively muffle any sound or noise, which can be manufactured cheaply and which presents a neat and ornamental appearance.

Referring to the drawings which illustrate the preferred form of our invention, 1 and 2 desi nate, respectivel the inner and outer shel s or walls of the evice between which a layer 3 of sound-deadening felt is arranged. These shells are preferably of semi-spherical shape and the inside shell is of reat enough dimensions to receive the ear 0 a person so that no inward pressure will be exerted on the ear drum when the device is placed over the ear. The felt 3 projects outwardly beyond the edges of the shells so as to form a yielding cushion 4 that will conform to the shape of the side of the head and face of the erson and thus form a tight seal or joint. vhile we prefer to use a layer of felt 3 be tween the shells we do not wish it to be understood that our invention is limited to this exact construction as any suitable material which will deaden sound can be used as the filler between the shells.

As shown in Fig. 2, the inner shell 1 is provided at its outer edge with an outwardly projecting flange 5 which bears upon the felt and securely clam s it in position. The shells are preferably formed from papiermach, hard rubber or some other material that can be molded so as to enable the device to be manufactured at a low cost and the .device is provided with a clamp 6, formed of spring material, for retaining it in operative position over the ear of a person, said clam being adapted to be passed over or aroun the head of the erson. Instead of utilizing the part 6 as a c amp or retaining member as just described, said part can be used as a handle which is grasped by the user to hold the device over the/ear, the part 6 being so connected to the device that the device can be turned around, as shown in dotted lines in Fig. 2, to present the ear-receiving opening away from the part 6.

The outer shell 2 15 provided with a tubular shaped socket piece 7 havingflanges 8 that are secured to the outer shell by fastening devices, and the part 6 is provided with a cylindrical shank 9 that is rotatably mounted in the socket piece 7 Notches 10 are formed in the socket piece 7 and the art 6 is provided adjacent its cylindrical shank with shoulders 11 which fit into said notches and w thus prevent the part 6 from rotating or turning in the socket piece. By movin the muffler longitudinally of the shank 9 of the art 6, the shoulders 11 will be disengaged rom the notches 10 and the muffler can then be turned into the position shown in dotted lines in Fig. 2. The shank 9 is rovided with a cross pin 12 which prevents t e shank from moving out of the socket iece. The device is adapted to be suspended by a cord 13 when it is not in use, the cord being attached to a clip 14 arranged underneath one of the flanges 8 of the socket piece, as shown in Fig. 3.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A device of the character described, comprising an inner and outer shell of semispherical shape, a layer of felt interposed between said shells and extending shghtly beyond the edge thereof, and a flange on the inner shell for clamping said felt in position; substantially as described.

2. A device of the character described, comprising an inner and outer shell formed of material that can be molded into shape, a layer of sound-deadening material interposed between said shells, said sound-dead ening material projecting beyond the edge of said shells to form a yielding cushion, and an outwardly projecting flange on the inner shell for clamping said material; substantially as described. v

3. A device of the character described,

comprisin an inner and outer shell of approximate y semi-spherical shape, a layer of sound-deadening material interposed between said shells, a socket piece secured to the outer shell, a spring clamp rovided with a, shank which fits in said soc et piece, and shoulders on said clamp which fit in notches in the edge of the socket piece; substantially as described.

4. A device of the character described,

an inner and outer shell of approximate y semi-spherical shape, a layer of sound-deadening material interposed between said shells, a socket piece secured to the outer shell, a spring clamp provided with comprising JOHN F. HIRSH. HAROLD M. HIRSH.

Witnesses:

WELLs L. CHURCH, GEORGE BAKEWELL. 

